Which of the following is an example of positive gene regulation?

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#Question id: 15637

#SCPH06 I Botany

You have isolated two mutations in the Lac operon that cause constitutive expression of Lac genes. You designate these mutants Lac1– and Lac2–. Making use of an F' that carries the Lac operon with the LacY gene mutated, you construct strains that you test for both ß-galactosidase activity and Lac permease activity with results shown below.

     

Classify each mutation as dominant or recessive and as cis- or trans-acting, giving the experimental result that allows you to arrive at each conclusion. Finally, deduce what type of Lac mutation best fits the properties of Lac 1– and of Lac 2–.

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#Question id: 15007

#SCPH12 I Genetics

You set up a cross between true breeding wild type male fruit flies and true breeding female flies with a yellow body color. You notice in the F1 generation that half the flies, specifically all the males, have yellow body color while the females are wild type (gray). Which of the following explanations is the most likely?

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#Question id: 14504

#SCPH01 Biochemistry

If the probability of a defective bolt is 0.1, the mean and standard deviation for the distribution of defective bolts in a total of 500 are

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#Question id: 1705

#SCPH05 I Biotechnology

What is the single best definition of the most common form of antigen recognized by the T-cell receptor (TCR)

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#Question id: 5324

#SCPH28 | Zoology

In eusocial insects, males develop from unfertilized eggs while females develop from fertilized eggs. The ultimate consequence of this difference is that